Die head



Nov. 6 1923.

c. Jpss'r DIE HEAD Filed Jan. 29 1921 2 Sheets-Sheet 1 Nov. 6 W23.1,472,912

C. JOBST DIE HEAD Filed Jan. 29. 1921 2 Sheets-Sheet 2 IHVE TI T UHPatented Nov; 6, 1923.

CONRAD J'OBST, OF TOLEDO, OHIO, .ASSIGNOR TO ROBERT L. ELLERY, 0FTOLEDO, OHIO.

DIE HEAD.

Application filed January 29, 1921. Serial No. 440,837.

To all whom it may concern:

Be it known that I, Comm) J oasr, a citizen of the United States, and aresident of Toledo, in the county of Lucas and State of Ohio, have madean Invention Appertaining to Die Heads; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to the characters of reference marked thereon, which form a part ofthis specification.

This invention relates to die heads, and particularly to those of the.thread cutting type used in connection with automatic machines.

An object of my invention is the provision of a new and simple die headof the class described, which is easily and quickly adjustable to tripand permit an opening movement of the chasers when a thread ofpredetermined length has been cut.

Another object of the invention is the provision of a die head of theclass described, which is capable of use either as a' rotary head withthe work stationary, or as a stationary head with the work rotatable,there by adapting it foruse on different types of machines.

Further objects and advantages of the invention will be apparent fromthe following detailed description thereof.

While the invention in its. broader aspect is capable of embodiment innumerous forms a preferred embodiment thereof is illustrated in theaccompanying drawings, in which,

Figure 1 is a side elevation of a die head embodying the invention,witha part broken away. Fig. 2 is an inner end view thereof with the shankremoved- Fig 3 is a see tion on' the line 33 in F ig. 4, with parts infull. Fig. 4 is an outer end view of the head. Fig. 5 is a section onthe line 55 in Fig. 4. with parts in full and with the shank re1noved.Fig. 6 is a section on the line 6-6 in Fig. 4, with parts in full. Fig.7 is an outer end .view of the head with the chasers in full, and Fig. 9is a cross-section on the line 9-9 in Fig. 3.

Referring to the drawings, 1 designates a die holder having a workreceiving opening 2 axially therethrough and being carried at its innerend by a plate 3 for limited yielding movements axially thereof. A shanka is attached to the outer side of the plate 3 centrally thereof toadapt the plate to be fastened to the tool post or other suitablecarrying part of a machine. The plate 3 has two pins 5 projectingloosely into sockets 6 in the inner end of the holder 1 to guide therelative movements of the plate and holder. Screws 7 project from theinner end of the holder into sockets 8 in the plate 3 and coiledcompression springs 9 encircle the screws between the'heads thereof andthe bases of the sockets to normally retain the holder and plate inabutment and to permit a limited outward relative movement thereof.

The holder 1 has its outer end provided with four radial recesses 10,equidistantly spaced therea-round for receiving floating chaser carryingslides 11 for radial reciprocatory movements therein. The outer endportion of the holder 1 is reduced in size, as shown at 12, and theinner end portion thereof, as Well as a-portion of the inner end of theplate 3, in the present instance, are reduced in size to form an annularrecess 13 therearound.

Each chaser slide 11 has a pin or stud 14 projecting from its bottom.through a'registering radially disposed slot 15 in the top wall of a.radial socket 16 provided in the holder below each recess 10 thereof,and a coiled compression spring 17 isdisposed in the base of each recess16 and bears outward against the associated stud 14: to normally retainthe chaser slide at. the outer end of its movement relative to 1 theholder. Each chaser slide is of U form, and a chaser 18 is mountedtherein in radial relation to'the holder and with its cutting enddisposed within the central opening 2 thereof. Each chaser is fixedlysecured to its carrying slide 11 by a. screw 19. The outer end of eachchaser is tapered longitudinally of the head,

. and outer end plates removed. Fi 8 is a as shown at 20, for thepurpose hereinafter described. A segmental plate 21 is secured to theouter end of theholder 1 between each pair of ohasers 18 by screws 22with the ends of the lates in lapping relation to the adjacent sides 11to slidingly retain the slides in the holder recess 10.

' A collar 23 is mounted in the holder recess 13, being of a lengthshorter than said recess to enable it to have reciprocatorymovementstherein of predetermined len h. A sleeve 24 is threaded at its inner ento the collar 23 for adjustment longitudinally thereof and extendstherefrom to the outer end portion of the holder 1 and has its outer endopening restricted in size to fit the outer reduced end portion 12 ofthe holder and forms an internal annular tapered surface 25 for coactionwith the tapered ends 20 of the chasers 18, whereby an outward movementof the chasers with the holder 1 rela- The collar 23 is providedinteriorly,

thereof with an annular recess 28 in which a pair of segmental lockingarms 29 are mounted for locking movements transversely of the collaraxis and at opposite sides thereof. These arms have adjacent endspivoted to the collar at 30, while the opposite. ends thereof terminatein adjacent position at the opposite side of the collar axis to thepivots 30 and are tapered or fashioned at their ends .to cooperate toform an outwardly tapering recess th'erebetween. Each arm 29 is providedat its inner side intermediate its ends with a spur or inward projection31 adapted to project into a registering recess 32 and to engage with awall of such recess to lock the collar at the limit of its movementtoward the plate 3. The walls of the recesses 32 with which the arms 29coact are formed by hardened insertplates 33.

Screws 34 (Fig. 5) project from the outer end of the collar 23 intorecesses 35 provided longitudinally in the outer end portion of theholder 1, and coiled compression springs 36' encircle the screws withinthese recesses between the bases thereof and the heads of the screws tocause the screws to act to normally retain the collar 23 at the limit ofits outward movement relative to the holder. It is thus evident thatupon a release of the locking arms 29 from within the holding recesses32 in the holder the collar and tapered chaser coacting sleeve 24 willbemoved outward to chaser releasing position by the action of thesprings 36 on the screws 34. r

A trip lever 37 for the locking arms 29 extends longitudinally of thedie head, being pivoted at one end at 38 in a recess or opening 39 ofthe plate 3 and extending therefrom into an internal longitudinal recess40 in the collar 23 (Fig. 3). The recess 40 registers with the taperedspace between the free ends of the locking-arms 29, and the lever 37 hasits free end projecting between the free ends of said arms and taperedor of wedge shape both longitudinally and transversely of the lever sothat either an inward radial movement of the lever end or a rearwardlongitudinal movement thereof relative to the holder 1 and collar 23will cause an outward swinging of the lockingarms 29 to withdraw theirspurs 31 from the locking recesses 32 in the holder. The locking arms 29are normally held in locking engagement with the holder 1 by a bowedspring 41 which mounted in a collar recess 28 at'the'outer sides of thelocking arms 29 and has its ends bearing inward against the arms, asshown in Fig. 9. A trip pin 42 (Fig. 3) projects outward from the recess40 through an opening in the collar 23 and has its inner end inengagement with the trip lever 37 whereb an inward pressure on the trippin 42 Wlll swing the lever inward and efl'ect a tripping of the lockingarms 29. It is evident that a tripping of the lever may be manuallyaccom plished at any time by an inward pressure on the trip pin 42 or bythe trip pin at a predetermined point in a longitudinal movement of'thedie head striking a member disposed in its path of movement.

When the collar 23 and sleeve 24 carried thereby havebeen moved tochaser releasing position they are returned to locking posi tion, withrespect to the holder 1 by the movement of a hand-lever 43. which isfulcrumed in a recess 44 in the plate 3 and has its inner end providedwith a segmental series of teeth in mesh with a rack bar 45. This barprojects from the inner end of the collar 23 longitudinally thereof andinto the recess 44.

The operation of my die head is as follows :A die-head having beensecured in the tool holder-pr carrying part of a machine in connectionwith which it is to be used, it is moved forward to work engagingposition, and if the machine is either of the type in which the work isrotated and the die-head held stationary against rotation, or viceversa, the threading of the work by the thread cutting action of thechasers will cause the holder 1 and parts carried thereby, namely thechasers. the collar 23, sleeve 24, and locking arms 29, in lookingengagement with the holder, to be moved forward relative to the plate 3,such relative movement being permitted by the en agement of the screw 7by the springs 9. Vhen the holder is moved forward.azpredetermineddistance relative to the plate 3 the tapered coaction of the trip lever37 with the ends of the locking arms 29 will have moved such armsoutward a sufficient extent to disengage their spurs 31 from lookingengagement with the insert plates 33 of the holder. Upon such release ofthe locking arms the collar 23 and sleeve 24, under the. action of thescrews 34 and sprin s 36 and also the outward pressure of the c asers'against the taper 25, will be moved quickly outward relative to theholder 1 and chasers 18, thereby releasing the engagement of the sleevetaper 25 with the chaser ends and permitting an outward opening movementof the chasers, which outward movement is influenced by the action ofthe springs 17 Or, if desired the pin 42 may be either manually orautomatically operated at a desired point in a movement of the dieholder to effect a release of the locking means irrespective of arelative longitudinal movement of the plate 3 and holder 1. y

It is evident with my die head that the holder 1, chasers 18 and chaserholding sleeve 24 are held as a unit in rigid relation during a threadcutting operation and that it is practically impossible to throw thechasers out of central alignment with the head by the cuttin action. Itis also evident that the die head may be easily and quickly adjusted fordifferent sizes of work by merely turning the sleeve 24 with respect tothe collar 23 and then turning the nut 26 into locking engagementtherewith.

I wish it understood that my invention is not limited to,any specificconstruction, arrangement or form of the parts, as it is capable ofnumerous modifications and changes without departing from the spirit ofthe claims.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is,-

1. In a die head, a holder, chasers carried by the holder for trueradial movements at right angles to its axis and normally movableoutward, means carried by the holder for acting'on the chas'ers toresist an outward movement thereof from operative position and normallymovablerelative to the holder axially thereof to permit such movement,means carrying the .first means in operative chaser holdingposition, andmeans associated with and movable relative to the holder and when at apredetermined pointin such movement acting to release such means. 7 a

2. In a die head, a carrying member, a chaser holder carried by themember for limited yielding outward axial movement relative thereto,chasers carried by the holder for true radial movements at right anglesto its axis and normally movable from operative position, means carriedby the holder and operable to hold the chasers in operative position andmovable lengthwise of the holder to release the chasers, meansreleasmany movable from operative position,

means carried by the holder and operable to releasably hold the chasersin operative position, said means being adjustable to change theoperative position of the chaser-s, means releasably locking the holderand first means together to hold the Chasers in operative position, andmeans operable to release the locking means to permit a movement of thechasers from operative position.

4. In a die head, a carrying member, a chaser holder carried bythemember for limited yielding axial movements relative thereto, chaserscarried for true radial sliding movements relative thereto, meanscarried by the holder for limited movements axially thereof and when inone position of its movement coacting with the chasers to retain them inoperative position, means locking the holder and first means inoperative chaser holding position, and means automatically operable. torelease the looking means when .a predetermined length of thread hasbeen cut.

5. In a die head, a carrying member, a

chaser holder carried by the member for the threading 0f the chasersonto a work a piece effecting a separation of the member and holder.

6. In a die head, a carrying member, '1 chaser holder carried by themember, a pluing movements by the holder, a collar mounted for limitedlongitudinal movements on the holder, a sleeve adjustably car:

. rality of 'chasers carried for true radial slid ried by the collar andhaving tapered coactionwith the, chasers to ad ustably retain theminoperative position when the collar is in one osition of its movementrelative to the ho der, means normally urging a movement of the collarfrom such operative chaser holding position, releasable locking meansfor retaining the collar in operative chaser holding relation to theholder, and means operable to release the locking means to permit achaser releasing movement of the collar and sleeve when a predeterminedlength of thread has been cut.

7. In a die head, a carrying member, a chaser holder carried by themember for limited axial movements relative thereto, means normallyretaining the member and holder at the limit of their inward relativemovements, a set of chasers carried for true radial-movements by theholder, means carried by the holder for limited relative movementslongitudinally thereof and having a tapered chaser coact'in part forholding the chasers in operative re ation when the means is in oneposition of its relative movement, means normally urgin a movement ofthe chaser coacting means rom operative chaser holding position, meansfor locking the chaser coacting means in operative chaser holdingrelation to the holder, and means automatically operable to release thelocking means when the chaser holder has moved outward a predetermineddistance relative to the carrying member.

8. In a die head, a carrying member, a chaser holder carried by themember for limited axial movements relative thereto, means normallyretaining the member and holder at the limit of their inward relativemovements, a set or chasers carried for true radial movements by-theholder, means carried by the holder for limited relative movementslongitudinally thereof and having atapered chaser coacting part forholding the chasers in operative relation when the means is in oneposition of its relative-movement, means normally urging a movement ofthe chaser coasting means from operative chaser holding position, meansfor locking the chaser coacting means in operative chaser holdingrelation to the holder, means automatically operable to release thelocking means when the chaser holder has moved outward a predetermineddistance relative to the carrying member, and means for returning thefirst means to operative chaser holding position.

9. In a die-head, a chaser holder, a set of chasers carried for radialmovements by the holder, means mounted on the holder for movementsaxially thereof, said means having tapered surfaces which coact with theouter ends of the chasers to hold them 1n operative position when themeans is in one position of its movement and permit outward releasingmovements of the chasers when the means is mdved from such position,means normally urging a chaser releasing movement of the first meansrelative to the 'holder, means for lockin the first means to the holderin operative c aser holding position, and means operable to release thelocking means to permit a normal chaser releasin movement of the firstmeans relative to the older.

10. In a die-head, a carr 'ng member a chaser holder carried by t e-member or limited axial movements relative thereto, a set of chaserscarried for radial movements by the holder, means carried by andembracin the holder and movable axially thereo said means having taperedportions for coaction with the outer ends of the chasers to revent anoutward movement of the latter rom operative position when the means isin one osition of its movement relative to the hol er, means urging achaser releasing movement to thefirst means, locking means for engagingthe holder and first means at opposite sides of their axes to hold thefirst means .in operative chaser holding position, and meansautomatically operable to release and permit a chaser releasing movementof the first means relative to the holder when the holder has been movedoutward a predetermined distance relative to its carrying member.

11. In a die-head, a carrying member, a chaser holder carried by themember for limited axial movements relative thereto, a set of chaserscarried for radial movements by the holder, means carried by and movableaxially of the holder and having a conical portion coacting with theouter ends of the chasers to hold the-chasers in operative position whenthe means is in one positlon of its movement, means urging a chaserreleasing movement of the first means relative to the holder, aplurality of pivoted looking members carried by one of said holder andfirst means and adapted to coact with the otherat spaced points aroundits axis to lock the first means in operative chaser holdin position,and means for acting on the 100 'ng members to release and permit achaser releasing movement of the first means relative to the holder whenthe holder has moved outwardl a predetermined extent relative to thecarrying member.

12. In a die-head, a ca ingmember, a chaser holder carried by t e memberfor limiting axial movements relative thereto, means normally retainingthe member and holder at the limit of their inward relative movements, aset ofchasers carried for radial movements by the holder and normallyretain them in operative position when the operative chaser holdingposition, and 10 sleeve is in one position of its movement, meansoperable to move the locking arms to means normally urging a chaserreleasing release the locking connection between the movement of saidsleeve, 3. pair of arcuate sleeve and holder when the holder has movedarms pivotally carried by one of said holder outward a predeterminedextent relative to and sleeve and extending in opposite directhecarrying member.

tions from their pivots around the axis of In testimony whereof I havehereunto the holder and coacting with the other of signed my name tothis specification.

said sleeve and holder to lock the sleeve in CONRAD J OBST.

